const std = @import("std");
const driver_manager = @import("driver_manager.zig");
const api = @import("api.zig");

// DPU驱动数据结构
const DpuDriverData = struct {
    // 驱动私有数据
    allocator: std.mem.Allocator,
    device_count: u32,
    initialized: bool,
};

// DPU设备数据结构
const DpuDeviceData = struct {
    device_id: u64,
    program_loaded: bool,
    current_program_id: u32,
    operation_status: u32,
    // 其他DPU设备相关字段
};

// DPU驱动命令
pub const DPU_IOCTL_LOAD_PROGRAM = 0x301;
pub const DPU_IOCTL_UNLOAD_PROGRAM = 0x302;
pub const DPU_IOCTL_EXECUTE_DATAFLOW = 0x303;
pub const DPU_IOCTL_GET_STATUS = 0x304;
pub const DPU_IOCTL_SET_CONFIG = 0x305;

// DPU程序信息
const DpuProgramInfo = struct {
    program_id: u32,
    program_path: [256]u8,
    input_channels: u32,
    output_channels: u32,
    // 其他程序相关信息
};

// DPU数据流请求
const DpuDataflowRequest = struct {
    program_id: u32,
    input_buffers: [16]u64, // 物理地址
    output_buffers: [16]u64, // 物理地址
    input_sizes: [16]u64,
    output_sizes: [16]u64,
    buffer_count: u32,
    batch_size: u32,
};

// DPU设备状态
const DpuStatus = struct {
    device_id: u64,
    is_busy: bool,
    loaded_programs: u32,
    memory_usage: u64,
    temperature: u32,
    bandwidth: u64, // 字节/秒
    queue_depth: u32,
};

// DPU配置参数
const DpuConfig = struct {
    frequency: u32, // MHz
    power_mode: u8, // 0: 省电, 1: 平衡, 2: 高性能
    memory_limit: u64, // 字节
    queue_size: u32,
    batch_processing: bool,
};

// 初始化驱动
fn init_driver(allocator: std.mem.Allocator, driver_data: *anyopaque) bool {
    std.log.info("DPU driver initialized");
    
    // 分配驱动数据
    const dpu_data = allocator.create(DpuDriverData) catch {
        std.log.err("Failed to allocate DPU driver data");
        return false;
    };
    
    dpu_data.* = DpuDriverData{
        .allocator = allocator,
        .device_count = 0,
        .initialized = true,
    };
    
    // 存储驱动数据
    @atomicStore(*anyopaque, driver_data, dpu_data, .Release);
    return true;
}

// 清理驱动
fn deinit_driver(driver_data: *anyopaque) void {
    const dpu_data = @ptrCast(*DpuDriverData, @alignCast(@alignOf(DpuDriverData), driver_data));
    std.log.info("DPU driver deinitialized");
    dpu_data.allocator.destroy(dpu_data);
}

// 探测设备
fn probe_device(device_info: *driver_manager.DeviceInfo) bool {
    // 检查是否为DPU设备
    std.log.info("DPU driver probing device: VID={x}, PID={x}", .{device_info.vendor_id, device_info.device_id});
    
    // 这里我们假设DPU设备的类ID范围是0x0A0000到0x0AFFFF
    if (device_info.class_id >= 0x0A0000 and device_info.class_id <= 0x0AFFFF) {
        std.log.info("DPU device matched");
        return true;
    }
    
    return false;
}

// 移除设备
fn remove_device(device_id: u64) void {
    std.log.info("DPU driver removing device: {d}", .{device_id});
    // 这里应该清理与该设备相关的所有资源
}

// IO控制
fn ioctl_device(device_id: u64, cmd: u32, data: *anyopaque, size: u64) isize {
    std.log.info("DPU driver IOCTL: device={d}, cmd={x}, size={d}", .{device_id, cmd, size});
    
    switch (cmd) {
        DPU_IOCTL_LOAD_PROGRAM => {
            if (size < @sizeOf(DpuProgramInfo)) {
                return -1; // 缓冲区太小
            }
            
            const program_info = @ptrCast(*DpuProgramInfo, @alignCast(@alignOf(DpuProgramInfo), data));
            std.log.info("Loading program: ID={d}, Path={s}", .{program_info.program_id, &program_info.program_path});
            
            // 模拟程序加载过程
            std.log.info("Program loaded successfully");
            return 0;
        },
        
        DPU_IOCTL_UNLOAD_PROGRAM => {
            if (size < @sizeOf(u32)) {
                return -1; // 缓冲区太小
            }
            
            const program_id = @ptrCast(*u32, @alignCast(@alignOf(u32), data));
            std.log.info("Unloading program: ID={d}", .{program_id.*});
            
            // 模拟程序卸载过程
            std.log.info("Program unloaded successfully");
            return 0;
        },
        
        DPU_IOCTL_EXECUTE_DATAFLOW => {
            if (size < @sizeOf(DpuDataflowRequest)) {
                return -1; // 缓冲区太小
            }
            
            const request = @ptrCast(*DpuDataflowRequest, @alignCast(@alignOf(DpuDataflowRequest), data));
            std.log.info("Executing dataflow: Program ID={d}", .{request.program_id});
            std.log.info("Buffer count: {d}, Batch size: {d}", .{request.buffer_count, request.batch_size});
            
            // 模拟数据流执行
            std.log.info("Dataflow execution completed successfully");
            return @sizeOf(u64); // 返回结果大小
        },
        
        DPU_IOCTL_GET_STATUS => {
            if (size < @sizeOf(DpuStatus)) {
                return -1; // 缓冲区太小
            }
            
            const status = @ptrCast(*DpuStatus, @alignCast(@alignOf(DpuStatus), data));
            status.device_id = device_id;
            status.is_busy = false;
            status.loaded_programs = 1;
            status.memory_usage = 1024 * 1024 * 512; // 假设使用了512MB内存
            status.temperature = 68; // 假设温度为68°C
            status.bandwidth = 1024 * 1024 * 1024; // 假设带宽为1GB/s
            status.queue_depth = 0; // 假设队列为空
            
            return @sizeOf(DpuStatus);
        },
        
        DPU_IOCTL_SET_CONFIG => {
            if (size < @sizeOf(DpuConfig)) {
                return -1; // 缓冲区太小
            }
            
            const config = @ptrCast(*DpuConfig, @alignCast(@alignOf(DpuConfig), data));
            std.log.info("Setting DPU config: Freq={d}MHz, PowerMode={d}, MemLimit={d}MB, QueueSize={d}, BatchProcessing={}", 
                .{config.frequency, config.power_mode, config.memory_limit / (1024 * 1024), config.queue_size, config.batch_processing});
            
            // 模拟配置设置
            std.log.info("DPU config updated successfully");
            return 0;
        },
        
        else => {
            std.log.info("Unknown DPU IOCTL command");
            return -1; // 未知命令
        },
    }
}

// DPU驱动接口
pub const dpu_driver_interface = driver_manager.DriverInterface{
    .name = "dpu_driver",
    .description = "Data Processing Unit driver",
    .version = 1,
    .init = init_driver,
    .deinit = deinit_driver,
    .probe = probe_device,
    .remove = remove_device,
    .ioctl = ioctl_device,
};

// 导出驱动接口
export fn dpu_driver_get_interface() *driver_manager.DriverInterface {
    return &dpu_driver_interface;
}